The National Weather Service in Mount Holly has issued a Winter Storm Warning for South Jersey, beginning at 5 a.m. Monday and continuing through 5 p.m.

The storm will start as rain or sleet around 4 a.m., and quickly change to snow, the weather service says.

Snow will be heavy at times between 7 a.m. and noon — for part of that time, snow will fall at the rate of an inch an hour, wreaking havoc with the morning rush hour and canceling another day of school for some area students.

When it’s all over, South Jersey will have 4 to 6 inches of snow.

Temperatures will be in the lower 30s, and visibility will be limited.

After the snow ends mid-afternoon, any standing water or slush will freeze Monday night, when temperatures will drop into the teens.